util: add convertProcessSignalToExitCode utility #1545

Job	Run time
Build slim tarball	1m 35s
x86_64-darwin: with shared libraries	54m 24s
aarch64-darwin: with shared libraries	29m 15s
x86_64-linux: with shared libraries	31m 23s
aarch64-linux: with shared libraries	25m 45s
	2h 22m 22s

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